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Chemistry > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

Positive flame test for lithium

A

Crimson flame

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2
Q

Positive flame test for sodium

A

Yellow flame

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3
Q

Positive flame test for Potassium

A

Lilac flame

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4
Q

Positive flame test for calcium

A

Orange-red flame

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5
Q

Positive flame test for copper

A

Green flame

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6
Q

Sodium hydroxide precipitate reaction: positive test for copper (III)

A

Blue precipitate forms.

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7
Q

Sodium hydroxide precipitate reaction: positive test for iron (II)

A

Dark green/blue precipitate forms.

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8
Q

Sodium hydroxide precipitate reaction: positive test for iron (III)

A

Brown precipitate forms.

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9
Q

Sodium hydroxide precipitate reaction: positive test for magnesium

A

White precipitate forms, does not dissolve when excess NaOH is added

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10
Q

Sodium hydroxide precipitate reaction: positive test for calcium

A

White precipitate forms, does not disolve when excess NaOH is added.

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11
Q

Sodium hydroxide precipitate reaction: positive test for aluminium

A

White precipitate forms, dissolves when excess NaOH is added.

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12
Q

What is the test for halides?

A
  • Add a few drops of dilute nitric acid
  • Add a few drops of silver nitrate solution
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13
Q

Positive test for chloride ions?

A

A white precipitate forms.

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14
Q

Positive test for bromide ions?

A

A cream precipitate forms.

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15
Q

Positive test for iodide ions?

A

A yellow precipitate forms.

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16
Q

What is the test for carbonates?

A
  • Add a few drops of dilute acid
  • Test for carbon dioxide being produced.
17
Q

What is the test for sulfates?

A
  • Add a few drops of dilute HCl
  • Add a few drops of barium chloride solution
18
Q

What is the positive result for the sulfates test

A

A white precipitate forming.

19
Q

What is the test for chlorine gas?

A

Blue litmus paper
Bleaches

20
Q

How does chromatography separate substances?

A

By solubility and affinity for the paper.

21
Q

What is the stationary phase?

A

The chromatography paper.

22
Q

What is the mobile phase?

A

The solvent

23
Q

How do you calculate the RF value?

A

Distance moved by substance / Distance moved by solvent

24
Q

How does flame emission spectroscopy work?

A
  • Sample is put into a flame (electrons are exited)
  • Energy is given out as electrons drop back to lower energy levels
  • This is passed through a spectroscope
  • An emission spectrum is produced
25
Q

What is flame emission spectroscopy used to identify?

A

Metal ions and compounds.

26
Q

How does the melting point of impure substances differ to pure substances?

A

Impure substances melt over a range of temperatures (the more impure it is the larger the range).

Chemistry (10 decks)

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